SDL

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/*
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  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely.
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*/
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#define SDL_MAIN_USE_CALLBACKS 1
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#include <SDL3/SDL_test_common.h>
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#include <SDL3/SDL_main.h>
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typedef struct {
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    SDLTest_CommonState *state;
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    SDL_bool is_hover;
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    float x;
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    float y;
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    unsigned int windowID;
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} dropfile_dialog;
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SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[])
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{
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    int i;
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    dropfile_dialog *dialog;
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    SDLTest_CommonState *state;
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    /* Initialize test framework */
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    state = SDLTest_CommonCreateState(argv, SDL_INIT_VIDEO);
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    if (!state) {
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        return SDL_APP_FAILURE;
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    }
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    /* Enable standard application logging */
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    SDL_SetLogPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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    for (i = 1; i < argc;) {
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        int consumed;
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        consumed = SDLTest_CommonArg(state, i);
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        /* needed voodoo to allow app to launch via macOS Finder */
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        if (SDL_strncmp(argv[i], "-psn", 4) == 0) {
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            consumed = 1;
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        }
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        if (consumed == 0) {
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            consumed = -1;
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        }
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        if (consumed < 0) {
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            SDLTest_CommonLogUsage(state, argv[0], NULL);
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            goto onerror;
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        }
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        i += consumed;
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    }
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    if (!SDLTest_CommonInit(state)) {
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        goto onerror;
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    }
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    dialog = SDL_calloc(sizeof(dropfile_dialog), 1);
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    if (!dialog) {
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        goto onerror;
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    }
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    *appstate = dialog;
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    dialog->state = state;
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    return SDL_APP_CONTINUE;
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onerror:
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    SDLTest_CommonQuit(state);
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    return SDL_APP_FAILURE;
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}
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SDL_AppResult SDL_AppEvent(void *appstate, const SDL_Event *event)
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{
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    dropfile_dialog *dialog = appstate;
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    if (event->type == SDL_EVENT_DROP_BEGIN) {
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        SDL_Log("Drop beginning on window %u at (%f, %f)", (unsigned int)event->drop.windowID, event->drop.x, event->drop.y);
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    } else if (event->type == SDL_EVENT_DROP_COMPLETE) {
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        dialog->is_hover = SDL_FALSE;
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        SDL_Log("Drop complete on window %u at (%f, %f)", (unsigned int)event->drop.windowID, event->drop.x, event->drop.y);
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    } else if ((event->type == SDL_EVENT_DROP_FILE) || (event->type == SDL_EVENT_DROP_TEXT)) {
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        const char *typestr = (event->type == SDL_EVENT_DROP_FILE) ? "File" : "Text";
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        SDL_Log("%s dropped on window %u: %s at (%f, %f)", typestr, (unsigned int)event->drop.windowID, event->drop.data, event->drop.x, event->drop.y);
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    } else if (event->type == SDL_EVENT_DROP_POSITION) {
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        dialog->is_hover = SDL_TRUE;
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        dialog->x = event->drop.x;
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        dialog->y = event->drop.y;
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        dialog->windowID = event->drop.windowID;
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        SDL_Log("Drop position on window %u at (%f, %f) data = %s", (unsigned int)event->drop.windowID, event->drop.x, event->drop.y, event->drop.data);
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    }
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    return SDLTest_CommonEventMainCallbacks(dialog->state, event);
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}
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SDL_AppResult SDL_AppIterate(void *appstate)
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{
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    dropfile_dialog *dialog = appstate;
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    int i;
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    for (i = 0; i < dialog->state->num_windows; ++i) {
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        SDL_Renderer *renderer = dialog->state->renderers[i];
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        SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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        SDL_RenderClear(renderer);
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        if (dialog->is_hover) {
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            if (dialog->windowID == SDL_GetWindowID(SDL_GetRenderWindow(renderer))) {
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                int len = 2000;
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                SDL_SetRenderDrawColor(renderer, 0x0A, 0x0A, 0x0A, 0xFF);
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                SDL_RenderLine(renderer, dialog->x, dialog->y - len, dialog->x, dialog->y + len);
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                SDL_RenderLine(renderer, dialog->x - len, dialog->y, dialog->x + len, dialog->y);
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            }
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        }
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        SDL_RenderPresent(renderer);
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    }
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    return SDL_APP_CONTINUE;
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}
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void SDL_AppQuit(void *appstate)
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{
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    dropfile_dialog *dialog = appstate;
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    if (dialog) {
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        SDLTest_CommonState *state = dialog->state;
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        SDL_free(dialog);
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        SDLTest_CommonQuit(state);
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    }
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}
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